Add a JSON Reporter

lib/coverband.rb

@@ -137,6 +137,7 @@ def initialize
         require "coverband/utils/lines_classifier"
         require "coverband/utils/results"
         require "coverband/reporters/html_report"
+        require "coverband/reporters/json_report"
         init_web
       end
     end

lib/coverband/reporters/json_report.rb

@@ -0,0 +1,57 @@
+# frozen_string_literal: true
+
+# Outputs data in json format similar to what is shown in the HTML page
+# Top level and file level coverage numbers
+module Coverband
+  module Reporters
+    class JSONReport < Base
+      attr_accessor :filtered_report_files
+
+      def initialize(store, options = {})
+        coverband_reports = Coverband::Reporters::Base.report(store, options)
+        self.filtered_report_files = self.class.fix_reports(coverband_reports)
+      end
+
+      def report
+        report_as_json
+      end
+
+      private
+
+      def report_as_json
+        result = Coverband::Utils::Results.new(filtered_report_files)
+        source_files = result.source_files
+        {
+          **coverage_totals(source_files),
+          files: coverage_files(result, source_files)
+        }.to_json
+      end
+
+      def coverage_totals(source_files)
+        {
+          total_files: source_files.length,
+          lines_of_code: source_files.lines_of_code,
+          lines_covered: source_files.covered_lines,
+          lines_missed: source_files.missed_lines,
+          covered_strength: source_files.covered_strength,
+          covered_percent: source_files.covered_percent
+        }
+      end
+
+      # Using a hash indexed by file name for quick lookups
+      def coverage_files(result, source_files)
+        source_files.each_with_object({}) do |source_file, hash|
+          hash[source_file.short_name] = {
+            never_loaded: source_file.never_loaded,
+            runtime_percentage: result.runtime_relevant_coverage(source_file),
+            lines_of_code: source_file.lines.count,
+            lines_covered: source_file.covered_lines.count,
+            lines_missed: source_file.missed_lines.count,
+            covered_percent: source_file.covered_percent,
+            covered_strength: source_file.covered_strength
+          }
+        end
+      end
+    end
+  end
+end

lib/coverband/reporters/web.rb

@@ -90,6 +90,8 @@ def call(env)
               [200, coverband_headers(content_type: "text/json"), [debug_data]]
             when %r{\/load_file_details}
               [200, coverband_headers(content_type: "text/json"), [load_file_details]]
+            when %r{\/json}
+              [200, coverband_headers(content_type: "text/json"), [json]]
             when %r{\/$}
               [200, coverband_headers, [index]]
             else
@@ -109,6 +111,10 @@ def index
           open_report: false).report
       end
 
+      def json
+        Coverband::Reporters::JSONReport.new(Coverband.configuration.store).report
+      end
+
       def settings
         Coverband::Utils::HTMLFormatter.new(nil, base_path: base_path).format_settings!
       end

test/coverband/reporters/json_test.rb

@@ -0,0 +1,48 @@
+# frozen_string_literal: true
+
+require File.expand_path("../../test_helper", File.dirname(__FILE__))
+
+class ReportJSONTest < Minitest::Test
+  def setup
+    super
+    @store = Coverband.configuration.store
+    Coverband.configure do |config|
+      config.store = @store
+      config.root = fixtures_root
+      config.ignore = ["notsomething.rb", "lib/*"]
+    end
+    mock_file_hash
+  end
+
+  test "includes totals" do
+    @store.send(:save_report, basic_coverage)
+
+    json = Coverband::Reporters::JSONReport.new(@store).report
+    parsed = JSON.parse(json)
+    expected_keys = ["total_files", "lines_of_code", "lines_covered", "lines_missed", "covered_strength", "covered_percent"] 
+    assert expected_keys - parsed.keys == []
+  end
+
+  test "honors ignore list" do
+    @store.send(:save_report, basic_coverage)
+
+    json = Coverband::Reporters::JSONReport.new(@store).report
+    parsed = JSON.parse(json)
+    expected_files = ["app/controllers/sample_controller.rb", "app/models/user.rb"]
+    assert_equal parsed["files"].keys, expected_files
+  end
+
+  test "includes metrics for files" do
+    @store.send(:save_report, basic_coverage)
+
+    json = Coverband::Reporters::JSONReport.new(@store).report
+    parsed = JSON.parse(json)
+
+    expected_keys = ["never_loaded", "runtime_percentage", "lines_of_code", "lines_covered", "lines_missed", "covered_percent", "covered_strength"]
+
+    assert_equal parsed["files"].length, 2
+    parsed["files"].keys.each do |file|
+      assert_equal parsed["files"][file].keys, expected_keys
+    end
+  end
+end

test/test_helper.rb

@@ -33,6 +33,7 @@
 require "coverband/utils/lines_classifier"
 require "coverband/utils/results"
 require "coverband/reporters/html_report"
+require "coverband/reporters/json_report"
 require "webmock/minitest"
 
 require_relative "unique_files"
@@ -93,13 +94,13 @@ def setup
 def test(name, &block)
   test_name = "test_#{name.gsub(/\s+/, "_")}".to_sym
   defined = begin
-              instance_method(test_name)
-            rescue
-              false
-            end
+    instance_method(test_name)
+  rescue
+    false
+  end
   raise "#{test_name} is already defined in #{self}" if defined
 
-  if block_given?
+  if block
     define_method(test_name, &block)
   else
     define_method(test_name) do